Pin dirty page buffers and bump version to 1.1.0

[MaxAkbar]

Summary

• Keep dirty page data pinned in PageBufferManager so dirty buffers survive cache eviction before commit.
• Update TryGetDirtyPage to prefer pinned dirty buffers and then fall back to cache.
• Clear pinned dirty buffers when dirty/all state is cleared.
• Bump package version in Directory.Build.props from 1.0.0 to 1.1.0.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactor / maintenance
• Tests only

Related Issues

• None linked.

Testing

• dotnet build CSharpDB.slnx
• Relevant tests executed
• Manual verification performed (if applicable)

Checklist

• I followed the project style and conventions.
• I added or updated tests for behavior changes.
• I updated docs for user-facing changes.
• I verified no sensitive data was added.

Notes for Reviewers

• This change introduces _dirtyBuffers to preserve mutable dirty pages independent of cache eviction policy.

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